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Question
The two-wattmeter method is used to measure active power. The system is a 3-phase, 3- wire system. Then, the power reading is?
Options:
A .  Affected by both negative sequence and zero sequence voltages
B .  Affected by negative sequence voltages but not by zero sequence voltages
C .  Affected by zero sequence voltages but not by negative sequence voltages
D .  Not affected by negative or zero sequence voltages
Answer: Option D
Answer: (d).Not affected by negative or zero sequence voltages

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